Author
Topic: ZTS-110 installation help (Read 1150 times)

I'm trying to replace my current thermostat (Honeywell CT3611) for a ZTS-110 thermostat. I have a heat pump for cold and hot air and a furnace which should kick in as second stage heating. It's supposed to heat alone when external temperature is -12 Celsius. I believe this is achieved on the furnace itself with a trigger from the electric meter outside (higher electricity rates apply when outside temperature is below -12).

I attached the picture of the current wire connections.

Here is what I tried on the ZTS-110 (in this setup, stage 1 doesn't seem to heat and stage 2 only kicks the Heatpump in, not the furnace):

I got it, took out the multimeter to find out how the other thermostat would react and I redid the connections almost the same way but without the Y jumped to the B (w1 in my old thermostat), et voil?...

So maybe it was just a bad connection, loose wire, the only weird part is that now I have a 12V signal on the white cable (second stage) when in stage 1, but it's not enough to trigger the furnace relay as far as I can tell. It used to be around 6V with the honeywell thermostat.